Retirement Plans - Reconciliation of Changes In Pension And Postretirement Healthcare Plans Benefit Obligations And Fair Value Of Assets (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
U.S. Plans [Member]
Change in Plan Assets
Company contributions	$ 800	$ 800
Pension Plans [Member]
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”)
PBO/APBO at the beginning of year	27,416
PBO/APBO at the end of year	27,302	27,416
Change in Plan Assets
Balance at beginning of year	25,405
Balance at end of year	26,399	25,405
Funded Status of the Plans	(903)	(2,011)
Pension Plans [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation (“ABO”)	25,756	25,825
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”)
PBO/APBO at the beginning of year	26,426	28,702
Service cost	544	651	$ 835
Interest cost	1,362	1,218	1,020
Actuarial (gain) loss	(514)	(2,882)
Benefits paid	(1,534)	(1,263)
PBO/APBO at the end of year	26,284	26,426	28,702
Change in Plan Assets
Balance at beginning of year	24,826	25,970
Actual return on plan assets	1,674	(707)
Company contributions	831	826
Benefits paid	(1,534)	(1,263)
Balance at end of year	25,797	24,826	25,970
Funded Status of the Plans	(487)	(1,600)
Amount Recognized in the Balance Sheet at May 31:
Current pension, and other benefit obligations	(35)	(39)
Noncurrent pension, and other benefit obligations	(452)	(1,561)
Net amount recognized	(487)	(1,600)
Amounts Recognized in AOCL and not yet reflected in Net Periodic Benefit Cost:
Prior service cost (credit)	(39)	(47)
Pension Plans [Member] | International Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation (“ABO”)	885	848
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”)
PBO/APBO at the beginning of year	990	1,096
Service cost	38	44	56
Interest cost	42	34	32
Actuarial (gain) loss	3	(121)
Benefits paid	(39)	(35)
Settlements	(11)	(20)
Other	(5)	(8)
PBO/APBO at the end of year	1,018	990	1,096
Change in Plan Assets
Balance at beginning of year	579	663
Actual return on plan assets	12	(83)
Company contributions	50	55
Benefits paid	(39)	(35)
Settlements	(11)	(20)
Other	11	(1)
Balance at end of year	602	579	663
Funded Status of the Plans	(416)	(411)
Amount Recognized in the Balance Sheet at May 31:
Noncurrent asset	73	88
Current pension, and other benefit obligations	(22)	(23)
Noncurrent pension, and other benefit obligations	(467)	(476)
Net amount recognized	(416)	(411)
Amounts Recognized in AOCL and not yet reflected in Net Periodic Benefit Cost:
Prior service cost (credit)	3	4
Postretirement Healthcare Plans [Member]
Changes in PBO and Accumulated Postretirement Benefit Obligation (“APBO”)
PBO/APBO at the beginning of year	1,169	1,286
Service cost	27	37	48
Interest cost	61	55	41
Actuarial (gain) loss	18	(138)
Benefits paid	(89)	(107)
Other	(24)	36
PBO/APBO at the end of year	1,162	1,169	$ 1,286
Change in Plan Assets
Company contributions	67	71
Benefits paid	(89)	(107)
Other	22	36
Funded Status of the Plans	(1,162)	(1,169)
Amount Recognized in the Balance Sheet at May 31:
Current pension, and other benefit obligations	(81)	(84)
Noncurrent pension, and other benefit obligations	(1,081)	(1,085)
Net amount recognized	(1,162)	$ (1,169)
Amounts Recognized in AOCL and not yet reflected in Net Periodic Benefit Cost:
Prior service cost (credit)	$ (43)